Power-transmission device.



A. OALAME.

y PoWBR TRANSMISSION DEVICE.

APPLICATION FILED SEPT. 9, 1912.

2 SHEETS-*SHEET l.

Patentd Apr. 1, 1913 @if I POWER TRANSMISSION DEVICE. APPLICATION ULEBSEPT. s', 1912,

Pamed Apr. 1, ma

, applying power for rotating the casing l,

and in the form shown'the casingis pro- 'vided with a sprocket wheel 27for connec-` tion by means of a link beit to the engine shaft.

The operation of the device shown is as follows: Assuming for example,that the easing 1 is continuously driven in one direction by the engine,then the gears in the eoinpartment 8 will rotate in the directionindicated by the arrows in Fig. 2. also that there is a loadl on thedriven shafts 7 and 5, such as would be the case if they are connectedto' vehicle wheels resting on the ground, then it the brake member 17 isfree to rotate,I the resistance of ythe parts connected with the gear 12will be greater than that 'of the parts connected with the gear 11, andduring the rotation ot' the cas ing l the pinions 15 will roll idly onthc periphery of the gear 12 and Will cause the gears 14 to rotate thepinion 11. The engine will thus run idly Without rotating the shafts 7and 5. It', on the other hand, the brake band 1S is set up so as to`grip and prevent rotation of the brake drum 1T, the gear 1l will beheld stationary and the power applied to the casing 1 will be tra-nsfinittedt'hrougli the planetary gear trains 1% and l5 to the gear 12.Rotation of the gear 12 Wil-l be transmitted through tli"e differentialgear train in the usual manner, driving the shafts 7 and 5 at equalangular speeds in the saine direction. Differential movement of theshafts 5 and 7 is permissible in the usual manner regardless of whetherthe member .13 islbeing rotated by the gear 12 or not. During suchdili'ereiitial movement the gear 2O drives the. pinion 23,

vwhich drives its mate 2l, which in 'turn drives the gear 21.

1 From the foregoing it willvbe seen that' i'vli'enthe brake band 1S isengaged with the drinn 17,' the shafts 5 and 7 will be positivelydriven, and when the brake band is released the gearing will simply runidle without transmitting power to the shafts 7 and 5.

l Although lbut one specific embodiment oi this invention has beenherein shown and described,`it .will be understood that numerous detailsof the construction shown may be altered or omitted without. departingfrom the spirit of this invention as defined by the following claims.

ygears on said brake and I claim:- lvl( a power transmission device, the

combi iat-ion of a driving member, a driven member, anti a brakeineinber journaled in .coaxial relation to eaoli other; a pair of saidmembers,

members and iiiclosiiig` all of said gearing.

2. A power transmission device, comprising a pair of-shalts, a -drivingmember, a driven iiiember, and a brake' member, all joiiriialed incoaxiali'elation to each other; differential gearing connecting saiddriven member and said shafts; a pair of gears journaled in coaxialrelation to said shafts and respectively vconnected to said driven andbrake members; a gear train carried by said driving n'ieinber andcomprising a pair of pinions njiesliiiig respectively with the drivenmembers; and a casing carried by one ol said members and inelosiiig allof said gearing.

ln a power transmission device, the combination ot' a driving member, apair of coaxially arranged shafts, a pair` of gears loosel f mounted onone of said shafts within said lriving member, a pair of planetarypinioiis joiirnaled on said driving' member, said piiiioiis being'rigidly connected together and respectively meshing with said gears, adriven member rigidly connected to one of said gears, differential gearmechanisin interposed between said driven meinberv and said shafts andadapted to cause said sha'l'ts to rotate with said driven ineinher, andalso adapted to permit relative rotation ot said shafts, and mechanismindependent of said driving member and adapted toliold the other saidgear against rota tion and thereby control the ldriving relation betweensaid driving member and said shafts.

Signed at Chicago this (3th day of Septem-

